安装 Visual Studio Web Tools 的奇怪问题

安装Microsoft ASP.NET 5 RC 1 时提示

0x80070005 - 拒绝访问

日志文件为

[1968:3F64][2015-11-20T10:08:36]i010: Launching elevated engine process.
[1968:3F64][2015-11-20T10:08:37]i011: Launched elevated engine process.
[1968:3F64][2015-11-20T10:08:38]i012: Connected to elevated engine.
[2E38:3F28][2015-11-20T10:08:38]i358: Pausing automatic updates.
[2E38:3F28][2015-11-20T10:08:38]i359: Paused automatic updates.
[2E38:3F28][2015-11-20T10:08:38]i360: Creating a system restore point.
[2E38:3F28][2015-11-20T10:08:38]i361: Created a system restore point.
[2E38:3F28][2015-11-20T10:08:38]i370: Session begin, registration key: SOFTWAREMicrosoftWindowsCurrentVersionUninstall{5fefbd00-3078-41ea-a615-dbcce6a6f135}, options: 0x7, disable resume: No
[2E38:3F28][2015-11-20T10:08:44]e000: Error 0x80070005: Failed to secure cache path: C:ProgramDataPackage Cache
[2E38:3F28][2015-11-20T10:08:44]e000: Error 0x80070005: Failed to secure cache directory: C:ProgramDataPackage Cache
[2E38:3F28][2015-11-20T10:08:44]e000: Error 0x80070005: Failed to create completed cache path for bundle.
[2E38:3F28][2015-11-20T10:08:44]e000: Error 0x80070005: Failed to cache bundle from path: C:UsersouJianAppDataLocalTemp{5fefbd00-3078-41ea-a615-dbcce6a6f135}.beAspNet5.ENU.RC1.exe
[2E38:3F28][2015-11-20T10:08:44]e000: Error 0x80070005: Failed to begin registration session.
[1968:3F64][2015-11-20T10:08:44]e000: Error 0x80070005: Failed to begin registration session in per-machine process.
[1968:3F64][2015-11-20T10:08:44]e000: Error 0x80070005: Failed to register bundle.
[1968:3F64][2015-11-20T10:08:44]i399: Apply complete, result: 0x80070005, restart: None, ba requested restart:  No

解决方案：

C:ProgramDataPackage Cache 

右键，安全，对Administrators设置完全控制权限即可

但原因不明

Reference：

https://github.com/aspnet/Home/issues/1085#issuecomment-157787917

https://steamcommunity.com/app/266840/discussions/2/558755529944048520/?l=norwegian